Environmental Engineering Reference
In-Depth Information
Years
a)
Years
b)
￿ ￿ ￿ ￿ ￿
Years
c)
2.11 Dependence on the time failure in service (a), average recovery
time (b) and total unavailability (c) of the systems for monitoring
and control of the boiler: 60; - - - - 65; --------- 70 (mean
values and ranges)
data. In Ref. 25 it is proposed to determine the parameters of the linear
model [2.11] using the following information from the data on equipment
failures:
• fraction of failures associated with ageing in the general flow of
failures;
• the rate of failures not associated with ageing.
This approach makes it easy to obtain the desired parameters from the
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